Incandescent-electric-lamp socket



PATBNTBD JAN. 5," 19014.

H. A. FRAMBURG. INGANDBSGENT ELECTRIC LAMP SOCKET. APPLICATION FILED `AIR.. 9. 1903-. NO MDBL.

. f mmmlm l? mgnunnm HW ummm UNITED STATES Patented January 5, 1904. l

l PATENT OFFICE.

HENRY A. FRAMBURG, OF CHICAGO, ILLINOIS.

SPECIFICATION formingpart of Letters Patent No. 748,599,idated January5, 1904.

Application iiled April 9, 1903. Serial No. 151,714. (No model.)

To all whom it may concern:

Be it known that I, HENRY A. FEAMBUEG, a citizen of the United States,and a resident of the city of Chicago, county of Cook, and State ofIllinois,lhave invented certain new and useful Improvements inIncandescent- Electric-Lamp Sockets; and I hereby declare that thefollowing is a full, clear, and exact description of the same, referencebeing had to the accompanying drawings, and to the letters of referencemarked thereon, which form a part ot' this specification.

This invention relates to improvements inincandescent-electric-lamp-light sockets, and more particularlytoalight-socket adapted for use in conjunction with small lamps, such asare used for ornamental or decorative illuminating purposes.

Light-sockets such as heretofore in use are not readily adaptable forsmall lamps, owing to the small size and multiplicity of the parts.

The object of this invention is to provide a cheap, simple, and durableconstruction and one in which there are but few parts and in which thelamp-con tacts are directly supported from the insulator-plug by meansof a portion of the contact system, thereby enabling the construction tobe simplified.

The invention consists in the matters hereinafter described, and morefully pointed out and defined in the appended claims.

In the drawings, Figure 1 is a side elevation of a device embodying myinvention. Fig. 2 is an enlarged longitudinal section of the same. Fig.3 is a section taken on line 3`3 of Fig. 2, but showing the screws inelevation. Fig. 4 is a side elevation of the outer shell. Fig.4 5 is aside elevation of the cap. Figs. 6, 7, 8, 9, and l0 are views similar toFigs. l, 2, 3, 4, and 5, showing slight modifications of the cap andinsulator-sleeve In said drawings, A represents a lamp-bulb of the usualform of construction.

B represents the external shell or casing of the lamp-socket, the frontend of which is reduced in diameter, as usual, and which is provided atits rear end with a removable cap B', provided with an outwardlyextending screw-threaded sleeve b, adapted to screw directly to afixture. Said cap is provided with forwardly extending integral armsbb', which as usually constructed are inwardly offset to allow them topass within the shell B, which is slotted on opposite sides to receivethe shoulders formed by the offset. The lower ends of said slots areenlarged to receive the screws b2 b2, which extend therethrough andthrough threaded apertures in the lower end ofl said arms intoengagement with the insulatorplug C and hold the cap and casing firmlyin place. If preferred, however, said arms may be constructedwithout`the oset and the ends thereof bent to form inwardlydirectedprojections b3 b3, adapted to engage through suitable apertures in theshell B3 of the lamp-socket and in apertures in the plug C, as shown inFigs. 6 to l0, inclusive. Closely fitting within said shell andcomplemental therewith is the insulator-sleeve D of indurated fiber,rubber, or other suitable material, which together with aninsulatingwasher D'in the interior of the cap form acompleteinsulating-lining within said capand shell and prevents thepossibility of a short circuit should one of the contacts become loose.

A plug C,of rubber, porcelain, or any suitable insulating materiahfitsclosely within the insulating-sleeve D. Said plug fits closely in therear end of the shell and is transversely recessed across the rear endfor the admission ofthe leads and is cut away centrally on diametricallyopposite sides to provide independent chambers to receive thelead-terminals from said recess. One of said chambers is separated fromthe outer end of the lampsocket by the partition c, integral with saidplug, thereby preventing the lead-terminal `therein fromshort-circniting with the lampcontact. Within said chambers arecontactplates E and E', provided, respectively, with binding-screws eand e', which engage therethrough and serveto rigidly bind thelead-terminals into circuit therewith. The plate E extends rearwardlyand transversely of the plug vC to a point slightly beyond its centerand nis countersunk in the bottom of said recess,

providingapartition c',ofinsulatingmaterial, between it and the oppositelead. The plate E extends forwardly and transversely of the plug, thetransverse portion e2 extending through and along the under end of thethreaded metallic sleeve F, which forms one of the lamp-contacts.

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A contactscrew F' has threaded engagement with the transverse portion ofthe contact-plate E and extends axially through said plug from the innerend of the contact-sleeve F into position for the head f of said screwto be engaged by the other lamp-terminal. The transverse portion e2 ofthe contact plate E and the top of the lamp-contact are cut awaycentrally sufficiently to let the screw F' pass through and preventelectrical contact therewith, and an insulating-washer f', herein shownas a plurality of layers of mica, through which the screw F passes,rests on said transverse portion e2 of said contact-plate andinsulatesthe screw therefrom. Said screw F rigidly binds the lamp-contact F tothe insulator-plug.

If preferred, the lamp-contact F may have threaded engagement with theouter end portion of the insulating-sleeve D.

The operation is as follows: The upper end of the insulating-plug beingrecessed provides entrance of the leads to their respective chambers,which are completely separated and insulated from each other except forsaid recess. The screw F serves both as a means for transmitting thecurrent and for securing the lamp-contact F, the insulatorplug, and thecontact-plates in operative relation and also forms the connection forone of the bulbterminals. The current coming in at one lead passesthrough the plate E, contact-screw F', through the lamp and thecontact-plate E', and out at the opposite lead.

Obviously many details of construction may be varied without departingfrom the principles of this invention.

I claim as my inventionl. In a device of the class described thecombination in a lamp-socket, of an insulator- .sleeve therein, aninsulator-plug formed to provide terminal chambers on opposite sidesthereof intermediate it and the sleeve and having a transverse slotacross the top thereof connect-ing said chambers and adapted to admitthe terminal leads, a lamp-contact and means rigidly engaging thelamp-contact to said plug adapted to form part of the current source.

2. In a device of the class described the combination with alamp-socket, of an insulatorsleeve therein,an insulator-plug fittingclosely within said sleeve and having a transverse slot across the upperend thereof, oppositelydisposed terminal chambers therein communicatingwith said slot, a contact-plate in said slot and bent downwardly intoone of said chambers, a contact-plate in the opposite chamber andextending laterally beneath said plug, a screw-threaded lam p-contactand a contact-screw insulated therefrom and passing therethrough andthrough the insulatorplug into engagement Withthe contact-plate in saidslot.

3. In a device of the class described the com- `from the lamp-contactsleeve.

4. The combination in a lamp-socket, of a tapered casing havingforwardly-extending slots therein, a cap tted over the rear end of saidcasing, forwardly-directed arms thereon offset to pass within saidcasing and engage in said slots, an insulating-lining in said casing andcap, an oppositely-chambered insulating-plug therein, a threadedmetallic shell forming one lamp-contact, a contactscrew extendinglongitudinally through the plug and into the lampcontact,a contact-plateextending rearwardly and transversely of the plug into engagement withsaid screw, a contact-plate extending forwardly and transversely of theplug through and into engagement with the lamp-contact, binding-screwsin said contact-plates and a washer insulating the head of thecontact-screw from the contact-plate and lamp-contact shell.

5. In au incandescent electric lamp, alampsocket having upwardly-openingslots therein, a sleeved cap, integral arms adapted to secure said capin position, a threaded insulator-sleeve, an insulating-plug having atransverse groove in the top thereof, a lampcontact threaded to receivethe lamp-bulb and insulator-sleeve, an insulator-washer therein, acontact-screw extending longitudinally through said plug, and aplurality of contact-plates adapted to engage the screw and lamp-contactand form the lamp-terminais.

In testimony whereof I have hereunto subscribed my name in the presenceof two subscribing Witnesses.

HENRY A. FRAMBURG.

Witnesses:

C. W. HILLS, ALFRED C. ODELL.

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